Table of Contents
Can You Drink Tap Water in Wailuku?
Yes, Wailuku's tap water is generally considered safe to drink as Wailuku has no active health based violations of the Safe Drinking Water Act (SDWA) that we are aware of. Other factors such as lead piping in a home, or low levels of pollutants on immunocompromised individuals, should also be considered, however. To find more recent info we might have, you can check out our boil water notice page or the city's water provider website.
According the EPA’s ECHO database, from April 30, 2019 to June 30, 2022, Wailuku's water utility, Wailuku, had 0 violations of the Safe Drinking Water Act. For more details on the violations, please see our violation history section below. This assessment is based on the Wailuku water system, other water systems in the city may have different results.
While tap water that meets the EPA health guidelines generally won’t make you sick to your stomach, it can still contain regulated and unregulated contaminants present in trace amounts that could potentially cause health issues over the long-run. These trace contaminants may also impact immunocompromised and vulnerable individuals.
The EPA is reviewing if it’s current regulations around pollutant levels in tap water are strict enough, and the health dangers posed by unregulated pollutants, like PFAS.
Water Quality Report for Wailuku Tap Water
The most recent publicly available numbers for measured contaminant levels in Wailuku tap water are in its 2020 Water Quality Report. As you can see, there are levels which the EPA considers to be acceptable, but being below the maximum allowable level doesn’t necessarily mean the water is healthy.
Lead in tap water, for example, is currently allowed at up to 15ppb by the EPA, but it has set the ideal goal for lead at zero. This highlights how meeting EPA standards doesn’t necessarily mean local tap water is healthy.
EPA regulations continue to change as it evaluates the long term impacts of chemicals and updates drinking water acceptable levels. The rules around arsenic, as well as, lead and copper are currently being re-evaluated.
There are also a number of "emerging" contaminants that are not currently. For example, PFAS (Per- and polyfluoroalkyl substances), for which the EPA has issued a health advisory. PFAS are called "forever chemicals" since they tend not to break down in the environment or the human body and can accumulate over time.
We recommend looking at the contaminants present in Wailuku's water quality reports, or getting your home's tap water tested to see if you should be filtering your water.
Wailuku Tap Water Safe Drinking Water Act Violation History - Prior 10 Years
Below is a ten year history of violations for the water system named Wailuku for Wailuku in Hawaii. For more details please see the "What do these Violations Mean?" section below.
Is there Lead in Wailuku Water?
Based on the EPA’s ECHO Database, 90% of the samples taken from the Wailuku water system, Wailuku, between sample start date and sample end date, were at or below, 0.0 mg/L of lead in Wailuku water. This is 0% of the 0.015 mg/L action level. This means 10% of the samples taken from Wailuku contained more lead.
While Wailuku water testing may have found 0.0 mg/L of lead in its water, that does not mean your water source has the same amount. The amount of lead in water in a city can vary greatly from neighborhood to neighborhood, or even building to building. Many buildings, particularly older ones, have lead pipes or service lines which can be a source of contamination. To find out if your home has lead, we recommend getting you water tested.
No amount of lead in water is healthy, only less dangerous. As lead accumulates in our bodies over time, even exposure to relatively small amounts can have negative health effects. For more information, please check out our Lead FAQ page.
Are there PFAS in Wailuku Tap Water?
Currently, testing tap water for PFAS isn’t mandated on a national level. We do have a list of military bases where there have been suspected or confirmed leaks. There appears to be no military bases near Wailuku with suspected leaks.
With many potential sources of PFAS in tap water across the US, the best information we currently have about which cities have PFAS in their water is this ewg map, which you can check to see if Wailuku has been evaluated for yet.
Our stance is better safe than sorry, and that it makes sense to try to purify the tap water just in case.
What do these Violations Mean?
Safe Drinking Water Act Violations categories split into two groups, health based, and non-health based. Generally, health based violations are more serious, though non-health based violations can also be cause for concern.
Health Based Violations
- Maximum contaminant levels (MCLs) - maximum allowed contaminant level was exceeded.
- Maximum residual disinfectant levels (MRDLs) - maximum allowed disinfectant level was exceeded.
- Other violations (Other) - the exact required process to reduce the amounts of contaminants in drinking water was not followed.
Non-Health Based Violations
- Monitoring and reporting violations (MR, MON) - failure to conduct the required regular monitoring of drinking water quality, and/or to submit monitoring results on time.
- Public notice violations (Other) - failure to immediately alert consumers if there is a serious problem with their drinking water that may pose a risk to public health.
- Other violations (Other) - miscellaneous violations, such as failure to issue annual consumer confidence reports or maintain required records.
SDWA Table Key
| Field | Description |
|---|---|
| Compliance Period | Dates of the compliance period. |
| Status |
Current status of the violation.
|
| Health-Based? | Whether the violation is health based. |
| Category Code |
The category of violation that is reported.
|
| Code | A full description of violation codes can be accessed in the SDWA_REF_CODE_VALUES (CSV) table. |
| Contaminant Code | A code value that represents a contaminant for which a public water system has incurred a violation of a primary drinking water regulation. |
| Rule Code |
Code for a National Drinking Water rule.
|
| Rule Group Code |
Code that uniquely identifies a rule group.
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| Rule Family Code |
Code for rule family.
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For more clarification please visit the EPA's data dictionary.
Wailuku Water - Frequently Asked Questions
| By Mail: | COUNTY OF MAUI 200 SOUTH HIGH STREET, 5TH FLOOR WAILUKU, HI, 96793-2155 |
Existing customers can login to their Wailuku account to pay their Wailuku water bill by clicking here.
If you want to pay your Wailuku bill online and haven't made an account yet, you can create an account online. Please click here to create your account to pay your Wailuku water bill.
If you don't want to make an account, or can't remember your account, you can make a one-time payment towards your Wailuku water bill without creating an account using a one time payment portal with your account number and credit or debit card. Click here to make a one time payment.
Moving to a new house or apartment in Wailuku means you will often need to put the water in your name with Wailuku. In order to put the water in your name, please click the link to the start service form below. Start service requests for water bills typically take two business days.
Leaving your house or apartment in Wailuku means you will likely need to take your name off of the water bill with Wailuku. In order to take your name off the water bill, please click the link to the stop service form below. Stop service for water bills requests typically take two business days.
USER SUBMITTED RATINGS
- Drinking Water Pollution and Inaccessibility
- Water Pollution
- Drinking Water Quality and Accessibility
- Water Quality
The above data is comprised of subjective, user submitted opinions about the water quality and pollution in Wailuku, measured on a scale from 0% (lowest) to 100% (highest).
Related FAQS
Wailuku Water Quality Report (Consumer Confidence Report)
The EPA mandates that towns and cities consistently monitor and test their tap water. They must report their findings in an annual Consumer Confidence Report. Below is the most recent water quality report from Wailuku's Water. If you would like to see the original version of the report, please click here.
County of Maui
Department of Water Supply
2020 Drinking Water
Quality Report
“Providing Clean Water Efficiently”
Photo Credit: Rowena Kellough
County of Maui
Department of
Water Supply
What Is This Report About?
The Water Quality Report is sent to all customers every summer. The federal Safe Drinking Water Act (SDWA) requires that public water systems provide customers with a water quality report that summariz- es water quality information for the previous calendar year. We are committed to providing our custom- ers with this information because informed customers are our best allies.
Why are there contaminants in my drinking water?
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the Environmental Protection Agency’s Safe Drinking Water Hotline at
The sources of drinking water (both tap and bottled water) include rivers, lakes, streams, ponds, reser- voirs and wells. As water travels over the surface of the land or through the ground it dissolves naturally
Contaminants that may be present in drinking water sources include:
Microbial Contaminants - such as virus, protozoa and bacteria, may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife.
Inorganic Contaminants - such as salts and metals, which may be naturally occurring or result from urban storm water runoff, industrial or domestic wastewater discharges, oil and gas production, mining or farming.
Pesticides and Herbicides - may come from a variety of sources such as agriculture and residential uses.
Organic Chemical Contaminants - including synthetic and volatile organic chemicals, which are by- products of industrial processes and petroleum production, and can also come from gas stations, urban
Radioactive Contaminants - are naturally occurring.
In order to ensure that tap water is safe to drink, the EPA has regulations that limit the amount of certain contaminants in water provided by public water systems and require monitoring for these contaminants. Food and Drug Administration regulations establish limits for contaminants in bottled water, which must
How to Contact Us
Questions on water quality: Maui DWS Laboratory:
Questions about : DWS Administration: |
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All other DWS inquiries: |
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Drinking water in Hawaii - DOH Safe Drinking Water Branch : |
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EPA Safe Drinking Water Hotline: |
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Photo Credit: Rowena Kellough
Lead and Copper in your drinking water. Are you at risk?
Lead is not detectable in the Maui DWS systems. If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. The Maui DWS is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking.
If you are concerned that your home tap water may contain lead, contact the County of Maui Water Supply Lab
Chloramines
Water distributed in the Upper Kula system contains chloramines, a combination of chlorine and ammo- nia, as a drinking water disinfectant. Chloramines effectively kill bacteria and other microorganisms that may cause disease as well as produce fewer disinfection
Customers who maintain fish ponds, tanks, or aquariums should also make necessary adjust- ments in water quality treatment, as these disinfectants are toxic to fish. For further information or if you have any questions about chloramines call
Photo Credit: Rowena Kellough
Sodium in drinking water
There is no State or Federal maximum contaminant level for sodium. Although not required, monitoring for sodium is performed primarily to gather information for the consumers, the Safe Drinking Water Branch, and the Department of Water Supply. The EPA Drinking Water Advisory recommends that the sodium concentration in drinking water not exceed a range of 30 to 60 ppm because of the possible ad- verse effects on taste at higher concentrations. For persons on a
How is water quality maintained in the distribution system?
Flushing Program In the Upcountry Area to Improve Water
The Maui DWS is flushing waterlines in the Upcountry area to improve water quality in its
Residents should not be out of water during flushing. However, some residents in the immediate vicinity of the work may experience a temporary discoloration of their water as well as a drop in pressure. This discoloration does not pose a health risk; however residents should check their water before washing any laundry. If a flushing crew is in your neighborhood, please do not run water in your home unless it’s necessary. If you experience some discoloration in your water turn on each cold water faucet in your home and allow it to run for several minutes or until the water is clear.
If you experience any ongoing water quality problems please call the
Field Operations Office at
Automatic Flushing Devices
Automatic flushing device (AFD) allow water to be flushed from a hy- drant or stand pipe several times a day. This automatic flushing will help keep the water flowing through the pipes which will prevent water quality problems that can happen when the water does not move enough. You will be seeing these devices more frequently as the Wa- ter Department installs these devices in our various water systems. If you experience any ongoing water quality problems please call the Field Operations Office at
How can consumers maintain water quality?
Backflow Protection
A simple, but important component in plumbing that safeguards the drinking water supply. Higher water pressures elsewhere can cause a reversal in the normal flow of water. This may allow contaminated water to enter the water distribution system. Backflow prevention devices allow the water to flow in only one direction. The air gap between a faucet and water in the sink is the most common form of backflow prevention. Never leave a running hose in a bucket of water. The contents of the bucket could be “sucked back” into your home plumbing and potentially contaminate the water. Businesses in Maui County that are required to have backflow prevention devices should check them annually to ensure that they are working properly.
Immuno-Compromised People
Some people may be more vulnerable to drinking water contaminants than the general population.
ABBREVIATIONS/EXPLANATION OF TERMS
AL – Action Level
The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
CFU - Colony Forming Units
A measurement used to count the number of bacteria colonies found in water.
The average of 4 consecutive quarterly results at each monitored sample location. The LRAA should not exceed 80 ug/L for TTHM and 60 ug/L for HAA5
MCL - Maximum Contaminant Level
The highest level of contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
MCLG – Maximum Contaminant Level Goal
The level of contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
N/A – Not applicable
N/D – Not detected
ppb - parts per billion or micrograms per liter (ug/L)
One part per billion corresponds to approximately 1 second in 31.7 years.
ppm - parts per million or milligrams per liter (mg/L) One part per million corresponds to 1 second in 11.5 years.
ppt – parts per trillion or nanogram per liter (ng/L) One part per million corresponds to 1 second in 32,000 years.
pCi/L – picocuries per liter A measurement of radioactivity
not enforce these "secondary maximum contaminant levels" orPhoto Credit: Chris Kawaguchi "SMCLs." They are established only
as guidelines to assist public water systems in managing their drinking water for aesthetic considerations, such as taste, color and odor. These contaminants are not considered to present a risk to human health at the SMCL.
< - less than 90th Percentile
Represents the highest value found out of 90 percent of the samples taken in a representative group. If the 90th percentile is greater than the action level, it will trigger a treatment or other requirements that a water system must follow.
Source Water Assessment
A Source Water Assessment was completed in 2007 and updated in 2013 by the University of Hawaii Water Resources Research Center in conjunction with the Department of Health Safe Drinking Water Branch. The assessment provides technical assistance to public water systems to develop protection programs for drinking water sources. The assessment includes (1) delineation of the area around a drinking water source through which contaminants may travel to the drinking water supply, (2) inventory of activities that may lead to the release of contaminants within the delineated area, and (3) determination of the susceptibility of the water source experiencing a future contamination. You can find the delineated wellhead protection areas for the Department of Water Supply wells and information on how you can help protect your water source here:
Your Comments Are Welcome!
We welcome your questions, concerns and observations. We also encourage our customers to attend and participate at our meetings regarding our water utility. The Board of Water Supply usually meets on the 3rd Thursday of the month at 1:30 pm. Please call
Photo Credit: Chris Kawaguchi
2020 WATER QUALITY MONITORING RESULTS FOR THE: WAILUKU SYSTEM
This water has been tested and meets all Federal and State Standards. Testing was conducted and compiled in 2020 for reporting by July 2021. The following data is about your drinking water. Data listed are from the most recent testing and monitoring done in accordance with the regulations of the State of Hawaii Department of Health.
This water serves: Kahului, Kihei, Maalaea, Makena, Paia, Wailea, Waihee, Waiehu, and Wailuku
Source Name |
Origin |
Treatment |
Source Name |
Origin |
Treatment |
Source Name |
Origin |
Treatment |
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Iao Ditch |
Surface |
Microfiltration/ |
Waihee Wells |
Ground |
Chlorination |
North Waihee Wells |
Ground |
Chlorination |
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Chlorination |
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Kepaniwai Well |
Ground |
Chlorination |
Iao Tunnel |
Ground |
Chlorination |
Waiehu Heights Well |
Ground |
Chlorination |
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Kanoa Wells |
Ground |
Chlorination |
Mokuhau Wells |
Ground |
Chlorination |
Maui Lani Wells |
Ground |
Chlorination |
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Iao Well |
Ground |
Chlorination |
Kupaa Well |
Ground |
Chlorination |
Waikapu Well |
Ground |
Chlorination |
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Wailuku Wells |
Ground |
Chlorination |
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If a contaminant is NOT SHOWN, IT WAS NOT DETECTED
Source Water |
Unit |
Highest |
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EPA’s |
EPA’s |
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Is Your |
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Monitoring |
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Allowable |
Allowable |
Typical Source of |
Water Safe? |
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of |
Detected |
Range3 |
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Regulated |
Limits |
Limits |
Contamination7 |
Compliance |
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Measure |
Level2 |
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Contaminants1 |
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MCL4 |
MCLG5 |
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Met? |
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Barium |
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ppm |
0.011 |
ND – 0.011 |
2 |
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2 |
Erosion of natural deposits |
✓ Yes |
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Radiologicals, Alpha |
pCi/L |
4.5 |
15 |
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0 |
Erosion of natural deposits |
✓ Yes |
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particles |
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of certain minerals |
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Radiologicals, Beta |
pCi/L |
4.7 |
509 |
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0 |
Decay of natural and |
✓ Yes |
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Particles |
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manmade deposits |
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Fluoride |
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ppm |
0.13 |
4 |
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4 |
Erosion of natural deposits |
✓ Yes |
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Erosion of natural |
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Nitrate |
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ppm |
2.39 |
10 |
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10 |
deposits, runoff from |
✓ Yes |
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fertilizer use; leaching |
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from septic tanks, sewage |
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Chromium |
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ppb |
3.8 |
100 |
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100 |
Erosion of natural deposits |
✓ Yes |
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Erosion of natural |
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Lead |
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ppb |
0.54 |
158 |
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0 |
deposits; corrosion of |
✓ Yes |
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plumbing fixtures |
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Erosion of natural |
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Copper |
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ppm |
0.052 |
1.38 |
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1.38 |
deposits; corrosion of |
✓ Yes |
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plumbing fixtures |
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Distribution System |
Unit |
System |
System |
EPA’s |
EPA’s |
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Is Your |
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Monitoring |
Wide |
Allowable |
Allowable |
Typical Source of |
Water Safe? |
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of |
Wide |
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(Disinfection By- |
Highest |
Limits |
Limits |
Contamination7 |
Compliance |
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Measure |
Range3 |
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Products) |
1 |
LRAA6 |
MCL4 |
MCLG5 |
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Met? |
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TTHMs |
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✓ Yes |
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(Total |
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ppb |
42 |
80 |
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N/A |
Disinfection |
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Trihalomethanes) |
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HAAs (Haloacetic |
ppb |
4.8 |
60 |
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N/A |
Disinfection |
✓ Yes |
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Acids) |
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1 Detected Contaminant |
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6 |
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2 Highest detected level or highest average level found |
7 |
Possible source of contamination |
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3 Range of levels found |
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8 |
Action Level |
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4 Highest Level allowed by EPA |
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9 |
EPA considers 50 pCi/L to be the level of concern for beta particles |
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5 EPA’s goal
State Water System ID#: 212 |
Date Distributed: June 2021 |
2020 WATER QUALITY MONITORING RESULTS FOR THE: WAILUKU SYSTEM
Lead/Copper Rule Compliance Monitoring
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Unit |
90th |
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# of Samples |
Is Your |
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Sample |
Action |
Water Safe? |
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Contaminant1 |
of |
Percentile |
Above |
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Date |
Level |
Compliance |
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Measure |
Reading |
Action Level |
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Met? |
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Lead |
2018 |
ppb |
ND |
15 |
0 |
✓ Yes |
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Copper |
2018 |
ppm |
0.11 |
1.3 |
0 |
✓ Yes |
The next round of testing for the Wailuku System is
Infants and young children are typically more vulnerable to lead in drinking water than the general population. It is possible that lead levels at your home may be higher than at homes in the community as a result of material used in your home’s plumbing. If you are concerned about elevated Lead levels in your home’s water, you may wish to have your water tested. As a general practice, you should flush your tap for 30 seconds to 2 minutes before using the tap water, if you have not used it for
Unregulated Contaminants
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Sample |
Unit |
Highest |
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Contaminant1 |
of |
Detected |
Range3 |
SMCL4 |
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Date |
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Measure |
Level2 |
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Sodium |
2020 |
ppm |
62 |
* |
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Sulfate |
2020 |
ppm |
28.4 |
250** |
- No designated maximum limits but monitoring is required by Safe Drinking Water Branch
- Secondary Maximum Contaminant Level (SMCLs) Standards established as guidelines to assist public water systems in managing the aesthetic quality (taste, odor and color) of drinking water. EPA does not enforce SMCLs.
State Water System ID#: 212 |
Date Distributed: June 2021 |
2020 WATER QUALITY MONITORING RESULTS FOR THE: WAILUKU SYSTEM
Unregulated Contaminant Monitoring Rule
The 1996 amendments to the Safe Drinking Water Act (SDWA) require that once every five years, the U.S. Environmental Protection Agency (EPA) issue a new list of no more than 30 unregulated contaminants to be monitored by public water systems (PWS).
The first Unregulated Contaminant Monitoring Rule (UCMR 1) was published on September 17, 1999, the second (UCMR 2) was published on January 4, 2007, the third (UCMR 3) was published on May 2, 2012 and the fourth (UCMR4) was published on December 20, 2016. These contaminants do not have
The Unregulated Contaminant Monitoring Rule (UCMR) provides EPA and other interested parties with scientifically valid data on the occurrence of contaminants in drinking water. This national survey is one of the primary sources of information on occurrence and levels of exposure that the Agency uses to develop regulatory decisions for contaminants in the public drinking water supply.
UCMR 4 monitoring will occur from
In 2018, Maui DWS tested your water system for the following contaminants:
UCMR4 List |
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Germanium |
Manganese |
Profenofos |
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Chlorpyrifos |
Tebuconazole |
Dimethipin |
Total Permethrin |
Ethoprop |
Tribufos |
Oxyfluorfen |
HAA51 |
HAA6Br1 |
HAA91 |
Butylated hydroxyanisole |
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Quinoline |
1. HAA5 (dibromoacetic acid, dichloroacetic acid, monobromoacetic acid, monochloroacetic acid, trichloroacetic acid); HAA6Br (bromochloroacetic acid, bromodichloroacetic acid, dibromoacetic acid, chlorodibromoacetic acid, monobromoacetic acid, tribromoacetic acid); HAA9 (bromochloroacetic acid, bromodichloroacetic acid, chlorodibromoacetic acid, dibromoacetic acid, dichloroacetic acid, monobromoacetic acid, monochloroacetic acid, tribromoacetic acid, and trichloroacetic acid)
Unregulated |
Unit |
Sample |
System |
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Use or Environmental |
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Of |
Range3 |
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Contaminants1 |
Year |
Average |
Source7 |
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Measure |
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Naturally occurring element; |
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commercially available in |
EPA uses the Unregulated |
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combination with other |
Contaminant Monitoring Rule |
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Manganese |
ppb |
2018 |
0.12 |
ND – 2.10 |
elements and minerals; used |
(UCMR) to collect data for |
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in steel production, fertilizer, |
contaminants suspected to be |
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batteries and fireworks; |
present in drinking water but do |
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drinking water and wastewater |
not have |
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chemical; essential nutrient |
set under the Safe Drinking |
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Haloacetic Acids – |
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Water Act. The purpose of |
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Brominated |
ppb |
2018 |
3.20 |
0.53 - 8.30 |
Disinfection |
monitoring for these |
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(HAA6Br) |
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contaminants is to help EPA |
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decide whether the |
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Haloacetic Acids |
ppb |
2018 |
3.20 |
0.53 – 8.30 |
Disinfection |
contaminants should be |
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(HAA9) |
regulated. |
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State Water System ID#: 212 |
Date Distributed: June 2021 |
Contaminants
Wailuku
EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the Hawaii Department of Health, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (January 2019 - March 2019), tap water provided by this water utility was in compliance with federal health-based drinking water standards.
Utility details
- Serves: 68976
- Data available: 2012-2017
- Data Source: Surface water
- Total: 20
Contaminants That Exceed Guidelines
- Bromodichloromethane
- Bromoform
- Chromium (hexavalent)
- Dibromochloromethane
- Nitrate
- Nitrate and nitrite
- Total trihalomethanes (TTHMs)
Other Detected Contaminants
- 1%2C4-Dioxane
- Barium
- Bromochloroacetic acid
- Chlorate
- Chloroform
- Chromium (total)
- Di(2-ethylhexyl) phthalate
- Dibromoacetic acid
- Fluoride
- Haloacetic acids (HAA5)
- Selenium
- Strontium
- Vanadium
Reminder
Always take extra precautions, the water may be safe to drink when it leaves the sewage treatment plant but it may pick up pollutants during its way to your tap. We advise that you ask locals or hotel staff about the water quality. Also, note that different cities have different water mineral contents.